On our web we are using Telerik RadGrids from WAY back... version is several years old.
In production and on the web itself the Grids appear correctly and function correctly. No issues.
When on the server (Amazon EC2 instance - MIcrosoft Windows Server 2012 R2)
And running web in debug mode
The grids all appear with no columns organized... its like the data is just dumped in the grid.
Please see the image below.